reset counts for parallel sis import in case it's manually restarted
reset counts for parallel sis import in case it's manually restarted

test plan:
 * configure parallel sis imports
 * start a massive import
 * kill the job
 * in script/console, reset the batch's workflow_state to 'created',
   and call process on it
 * when it completes, the counts should be accurate, and not
   doubly include what was processed the first time before it was
   killed

Change-Id: Ib49a5b56fa9db88908ab386aa869614972ae66eb
Reviewed-on: https://gerrit.instructure.com/12420
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
Reviewed-by: Brian Palmer <3cb4e1df5ec4da2c7c4af7c52cec8cf340a55a10@instructure.com>

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